Electric heater.



c. E. JOHNSON. ELECTRIC HEATER.

APPLICATION FILED JAN. 22, 1909.

Patented Sept. 14, 1909.

will/170% .9021, Mil/( tive or. inoperative.

ITED ans TENT OFFICE.

CARL JOHNSON, OF LOS ANGELES, CALIFORNIA; ABSIGNOR OF ONE-HALF TO WM. W. i

' IDDING'I'ON, LOE ANGELES, CALIFORNIA.

ELEGTRIC HEATER.

Sp'eclflcatlon of Letters Patent.

Patented Sept. 14,1909.

Application filed January 22, 1909. Serial No. 473,638.

To all whom it may concern:

Be it known that I, CARL E. JOHNSON, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful Improvements in Electric Heaters, of which the following is a specification.

My invention relates to thatfclass of elec- -tric heaters in which a continuous Blast of 1 air is forced against and through an electrical heating element, and an im ortant object of my invention is to prov'i e a simple and effective device which may be readily connected in place on an ordinary electric fan motor, and which will utilize a low amperage in comparison to the volume of heat delivered thereby.

Another object is to provide a heater that is readil detachable from the'ngotoron which it mounted; thus permitting the fan to be used for cooling purposes.

Another object is to provide a'heaterin which a constant tension onthe resistance wires of which the heating element is formed will be automatically maintained while the electric current is passing therethrough.

A further object is to provide an electric heater that is simple in construction and highly efiicient in operation and economical in currentconsumption.

erly insulated therefrom, the whole bein detachably secured to the fan uard '0 an electric fan motor. Provision-1s also made whereby the circuit for supplying the motor is utilized for supplying the current to the heating element, so that the fan motor and heating element aresimultaneously opera- In the annexed drawings formin I a part ofthe specification: Figure 1-is a out elevationof a fan motor taken on line 1-1 of Fig. 2 with my heating device in place th'ereon. Fig. 2- is aside elevation of a fan motor with the guard and heater in section.

Fig. 3' is a detail of the method of mounting the resistance wire. Fig. 4 is. a face viewof another form of heater.

Referring more particularly to the draw ings, 5 designates an electric fan motor provided .the others. 'is attached to terminals ln'the base (not ith' a rotatable fan 6 of usual form. -Detac ably secured to the face of the motor frame by meansof bearing arms 7 is a wire fan guard 8 of a construction that will permit' of an easy attachment of my electric heater which will be fully described hereinafter. Guard 8 preferably consists ofa wire ring 9 having rigidly secured thereto a plurallty of wires 10'which extend at right angles therefrom, and are then bent-inwardly and radially as shown in Fig. 2, the ends rifiily engaging a smaller centrally dispo (1 wire ring 11, thus formingthe wire guard frame'of the motor fan. The inner ends of fan guard wires 10 project from their point of attachment to ring 9 at an angle therefrom, so as to formga resilient annular bearing for the reception of the eleca tric heating element 12, the ends of each \wire bein bent to form a seat 13.

T e electric heating element above referred to preferably consists of an annular wire ring 15 being bent inwardly at equal i tervals as at 16 and as best shown in Fig.

to form bearings for 'a plurality of grooved sistance 'res are strung. Concentrically mounte inside of ring 15 isa second annular ring 18 which is in the form of a compression spring. Mounted on this ring are a series of insulators 19 similar to the insulators 17 mounted on ring 15 and between lava inspglators 17 upon which the reeach two adjacent insulators is mounted a bearing arm 20 which projects outwardly and radially therefrom on the end ofwhich is mounted a rooved insulator 21 similar to esistance wire 22 of the heater shown) andis in electrical connection with the jcircuit of the fan motor so that the heater and motor may operate in unison? Wire 22 from its terminal in the motor base passes through an aperture 23 formed there- 1n, and is woven continuously around the various insulators as best shown in Fig. 1 of the drawings, the end of the wire as it leaves the last insulator passing through the aperture 23, and is connected to another terminal on the connection board (not shown) in the motor base.

In the form of heater illustrated in Fig} 1, the arms 20 are supplied to the compresslonspring 18, thus enabling a greater percentage of the resistance wire to be strung adjacent to the outer ends of .the fan blades 6, the air being forced in greater volume from that area.

In Fig. 4 is illustrated another form of heater which is preferably composed of a ring 24; similar to the ring 15, and is: pro vided with a series of insulators 25 similar to the other insulators. This form of heater is supplied, as in the preferred form, with a compression spring 26 upon which another series of insulators 27 are mounted, a resistance wire being woven around the various insulators as in the first described form. The compression spring is utilized for the purpose of maintaining an even tension on the resistance wire when the current is pass ing therethrough, as when the wire is heated it has a tendency to buckle and increase in length, thereby disarran ing and sometimes rendering the heating e ement inoperative. When it is desired to. detach'the,,heati ng element from the fan guard, the guard itself is first detached from the bearing arms 7, after which the heater may be easily detached therefrom, the ends of the wire leading from the heater to the terminals on the connection board being disconnected. The fan may .then be used for cooling or other purposes.

It will be observed from the foregoing de scription that I have provided a novel form of heater, whereby the resistance wires of which it is formed will at all times be maintained in an adjusted position, and one that is extremely economical and efiicient in op eration.

Having described my claim 'as new and desire to secure by Letters Patent is 1. In an electric heater, the combination with an air forcing means, of an electric heating element detachably secured thereto, and means to automatically adjust the heating-element while an electric current is passing therethroughw 2. In an electric heater, the combination with an air forcing means, of an electric heating element detachably secured thereto, and a compression spring secured to said heating element, said spring adapted to maintain said element in tension while a current is passing therethrough.

3. In an electrical heater, the combination of an electric fan motor, of an electric heatingelement detachably secured thereto, said element and motor being connected in parallel, and means to automatically adjust the heating element while a current is passin therethrough.

4. In an electric heater, the combination of an electric fan motor, of an electric heating element comprising an electric resistance,

said element being detachably secured to said fan motor and both being connected in parallel, and means to automatically adjust the heating element While a current is pass-'- ing therethrough.

5. In an electric heater, the combination x invention what I of an electric fan motor, of an electric heat ing element secured thereto, said element and motor being connected in parallel, and means to automatically adjust the heating element while a current is passing therethrough.

6. In an electric heater, the combination of an electric fan mot0r,of an electric heating element secured thereto, said element consisting of an endless annular ring and an annular compression spring concentrically mounted therein, and a resistance wire connecting the ring and the spring, whereby a constant tension is maintained on the wire while the heater is in operation.

7. An electric .heater, comprising an an nular ring and a compression spring concentrically mounted therein, and a resistance wire connectingsaid ring and spring.

8. In an electric heater, the combination of an air forcing'means, of an electric heating element detachably secured thereto, said element comprising a frame having insulators mounted thereon, a resistance wire mounted on the insulators of said frame, and

means to maintain a tension on the resistance wireduring the operation of the heater.

9. In an electric heater, the combination of a fan motor, of an electric heating element detachably secured thereto, said element comprising a frame having insulators mounted thereon, a resistance wire mounted on the insulators of said frame, and resilient meansto maintain a tension on the resistance wire during the operation of the heater.

10. An electric heater, comprising an an nular wire frame provided Wlth suitable insulators, a compression spring concentrically mounted within said annular frame and provided with a plurality of insulators, and a resistance wire passing around the insulators mounted on the frame and compression spring, said wire being connected to a source of electric energy.

11. In an electric heater, the combination with a fan motor provided with a fan guard, and an electric resistance detachablyusecured to said guard.

12. In an electric heater, the combination with a fan motor provided with a fan guard of a heating element detachably secure thereto, said element comprising a Wire frame provided with insulators, and an electric resistance wire on said frame, said wire ance wire connecting the two rings, said wire passing around and over the insulators on the rings.

14. In an electrlc heater, the combination of an elertrio'l'aii motor, of an elertrio heat ing element held in spring pressed engagement therewith, said element comprising two wire rings of different diameters concentrically arranged with respect to each other, a plurality of insulators mounted on each ring, and an electric resistance Wire eonnecting' the two rings, said wire passing around and over the insulators on the rings.

15. In an electric heater, the combination with a fan motor, a protective wireguard serured to said motor frame. a resilient holder formed integrally with said guard, and an electric heating element, said element detarhably mounted in said holder.

In witness that I claim the foregoing I ha \e hereunto subscribed my name this 15th day of January, 1909.

CARL E. JOHNSON.

\Vitnesses:

EDMUND A. STRAUSE, M. A. PALMER. 

